High Q monolithic capacitor with glass-magnesium titanate body
AssigneeSprague Electric Company
InventorIan Burn
Life of this patent
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Abstract
Monolithic capacitors having Q's of 3500 include copper electrodes buried in a non-reducible body that consists of a crystalline magnesium titanate phase and an intergranular glass phase. The crystalline phase contains magnesium meta-titanate and/or ortho-titanate. Magnesium di-titanate is excluded from the body as are the oxides of lead, bismuth and cadmium, which materials are reducible at the firing conditions necessary to preserve the integrity of the copper electrodes.
Claims6
A monolithic ceramic capacitor comprising a non-reducible glass-ceramic body having at room temperature a dielectric constant of about 10 and a Q at 1 MHz of greater than 1000, said body consisting of from 10% to 50% by weight of a non-reducible glass phase and from 50 to 90% by weight of a non-reducible crystalline ceramic phase, said ceramic phase being comprised of at least 85 mole percent magnesium titanate, a copper electrode being buried and cofired in said body and another electrode being in contact with said body and spaced from said buried copper electrode.
Dependencies are inferred from the claim text.